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Linux/drivers/pci/hotplug/pciehp_core.c

  1 /*
  2  * PCI Express Hot Plug Controller Driver
  3  *
  4  * Copyright (C) 1995,2001 Compaq Computer Corporation
  5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
  6  * Copyright (C) 2001 IBM Corp.
  7  * Copyright (C) 2003-2004 Intel Corporation
  8  *
  9  * All rights reserved.
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License as published by
 13  * the Free Software Foundation; either version 2 of the License, or (at
 14  * your option) any later version.
 15  *
 16  * This program is distributed in the hope that it will be useful, but
 17  * WITHOUT ANY WARRANTY; without even the implied warranty of
 18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 19  * NON INFRINGEMENT.  See the GNU General Public License for more
 20  * details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 25  *
 26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
 27  *
 28  */
 29 
 30 #include <linux/module.h>
 31 #include <linux/moduleparam.h>
 32 #include <linux/kernel.h>
 33 #include <linux/slab.h>
 34 #include <linux/types.h>
 35 #include <linux/pci.h>
 36 #include "pciehp.h"
 37 #include <linux/interrupt.h>
 38 #include <linux/time.h>
 39 
 40 /* Global variables */
 41 bool pciehp_debug;
 42 bool pciehp_poll_mode;
 43 int pciehp_poll_time;
 44 static bool pciehp_force;
 45 
 46 #define DRIVER_VERSION  "0.4"
 47 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
 48 #define DRIVER_DESC     "PCI Express Hot Plug Controller Driver"
 49 
 50 MODULE_AUTHOR(DRIVER_AUTHOR);
 51 MODULE_DESCRIPTION(DRIVER_DESC);
 52 MODULE_LICENSE("GPL");
 53 
 54 module_param(pciehp_debug, bool, 0644);
 55 module_param(pciehp_poll_mode, bool, 0644);
 56 module_param(pciehp_poll_time, int, 0644);
 57 module_param(pciehp_force, bool, 0644);
 58 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
 59 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
 60 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
 61 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");
 62 
 63 #define PCIE_MODULE_NAME "pciehp"
 64 
 65 static int set_attention_status (struct hotplug_slot *slot, u8 value);
 66 static int enable_slot          (struct hotplug_slot *slot);
 67 static int disable_slot         (struct hotplug_slot *slot);
 68 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
 69 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
 70 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
 71 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
 72 static int reset_slot           (struct hotplug_slot *slot, int probe);
 73 
 74 /**
 75  * release_slot - free up the memory used by a slot
 76  * @hotplug_slot: slot to free
 77  */
 78 static void release_slot(struct hotplug_slot *hotplug_slot)
 79 {
 80         struct slot *slot = hotplug_slot->private;
 81 
 82         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
 83                  __func__, hotplug_slot_name(hotplug_slot));
 84 
 85         kfree(hotplug_slot->ops);
 86         kfree(hotplug_slot->info);
 87         kfree(hotplug_slot);
 88 }
 89 
 90 static int init_slot(struct controller *ctrl)
 91 {
 92         struct slot *slot = ctrl->slot;
 93         struct hotplug_slot *hotplug = NULL;
 94         struct hotplug_slot_info *info = NULL;
 95         struct hotplug_slot_ops *ops = NULL;
 96         char name[SLOT_NAME_SIZE];
 97         int retval = -ENOMEM;
 98 
 99         hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
100         if (!hotplug)
101                 goto out;
102 
103         info = kzalloc(sizeof(*info), GFP_KERNEL);
104         if (!info)
105                 goto out;
106 
107         /* Setup hotplug slot ops */
108         ops = kzalloc(sizeof(*ops), GFP_KERNEL);
109         if (!ops)
110                 goto out;
111 
112         ops->enable_slot = enable_slot;
113         ops->disable_slot = disable_slot;
114         ops->get_power_status = get_power_status;
115         ops->get_adapter_status = get_adapter_status;
116         ops->reset_slot = reset_slot;
117         if (MRL_SENS(ctrl))
118                 ops->get_latch_status = get_latch_status;
119         if (ATTN_LED(ctrl)) {
120                 ops->get_attention_status = get_attention_status;
121                 ops->set_attention_status = set_attention_status;
122         }
123 
124         /* register this slot with the hotplug pci core */
125         hotplug->info = info;
126         hotplug->private = slot;
127         hotplug->release = &release_slot;
128         hotplug->ops = ops;
129         slot->hotplug_slot = hotplug;
130         snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
131 
132         ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:00 sun=%x\n",
133                  pci_domain_nr(ctrl->pcie->port->subordinate),
134                  ctrl->pcie->port->subordinate->number, PSN(ctrl));
135         retval = pci_hp_register(hotplug,
136                                  ctrl->pcie->port->subordinate, 0, name);
137         if (retval)
138                 ctrl_err(ctrl,
139                          "pci_hp_register failed with error %d\n", retval);
140 out:
141         if (retval) {
142                 kfree(ops);
143                 kfree(info);
144                 kfree(hotplug);
145         }
146         return retval;
147 }
148 
149 static void cleanup_slot(struct controller *ctrl)
150 {
151         pci_hp_deregister(ctrl->slot->hotplug_slot);
152 }
153 
154 /*
155  * set_attention_status - Turns the Amber LED for a slot on, off or blink
156  */
157 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
158 {
159         struct slot *slot = hotplug_slot->private;
160 
161         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
162                   __func__, slot_name(slot));
163 
164         pciehp_set_attention_status(slot, status);
165         return 0;
166 }
167 
168 
169 static int enable_slot(struct hotplug_slot *hotplug_slot)
170 {
171         struct slot *slot = hotplug_slot->private;
172 
173         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
174                  __func__, slot_name(slot));
175 
176         return pciehp_sysfs_enable_slot(slot);
177 }
178 
179 
180 static int disable_slot(struct hotplug_slot *hotplug_slot)
181 {
182         struct slot *slot = hotplug_slot->private;
183 
184         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
185                   __func__, slot_name(slot));
186 
187         return pciehp_sysfs_disable_slot(slot);
188 }
189 
190 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
191 {
192         struct slot *slot = hotplug_slot->private;
193 
194         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
195                   __func__, slot_name(slot));
196 
197         pciehp_get_power_status(slot, value);
198         return 0;
199 }
200 
201 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
202 {
203         struct slot *slot = hotplug_slot->private;
204 
205         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
206                   __func__, slot_name(slot));
207 
208         pciehp_get_attention_status(slot, value);
209         return 0;
210 }
211 
212 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
213 {
214         struct slot *slot = hotplug_slot->private;
215 
216         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
217                  __func__, slot_name(slot));
218 
219         pciehp_get_latch_status(slot, value);
220         return 0;
221 }
222 
223 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
224 {
225         struct slot *slot = hotplug_slot->private;
226 
227         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
228                  __func__, slot_name(slot));
229 
230         pciehp_get_adapter_status(slot, value);
231         return 0;
232 }
233 
234 static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
235 {
236         struct slot *slot = hotplug_slot->private;
237 
238         ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
239                  __func__, slot_name(slot));
240 
241         return pciehp_reset_slot(slot, probe);
242 }
243 
244 static int pciehp_probe(struct pcie_device *dev)
245 {
246         int rc;
247         struct controller *ctrl;
248         struct slot *slot;
249         u8 occupied, poweron;
250 
251         if (pciehp_force)
252                 dev_info(&dev->device,
253                          "Bypassing BIOS check for pciehp use on %s\n",
254                          pci_name(dev->port));
255         else if (pciehp_acpi_slot_detection_check(dev->port))
256                 goto err_out_none;
257 
258         ctrl = pcie_init(dev);
259         if (!ctrl) {
260                 dev_err(&dev->device, "Controller initialization failed\n");
261                 goto err_out_none;
262         }
263         set_service_data(dev, ctrl);
264 
265         /* Setup the slot information structures */
266         rc = init_slot(ctrl);
267         if (rc) {
268                 if (rc == -EBUSY)
269                         ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n");
270                 else
271                         ctrl_err(ctrl, "Slot initialization failed\n");
272                 goto err_out_release_ctlr;
273         }
274 
275         /* Enable events after we have setup the data structures */
276         rc = pcie_init_notification(ctrl);
277         if (rc) {
278                 ctrl_err(ctrl, "Notification initialization failed\n");
279                 goto err_out_free_ctrl_slot;
280         }
281 
282         /* Check if slot is occupied */
283         slot = ctrl->slot;
284         pciehp_get_adapter_status(slot, &occupied);
285         pciehp_get_power_status(slot, &poweron);
286         if (occupied && pciehp_force) {
287                 mutex_lock(&slot->hotplug_lock);
288                 pciehp_enable_slot(slot);
289                 mutex_unlock(&slot->hotplug_lock);
290         }
291         /* If empty slot's power status is on, turn power off */
292         if (!occupied && poweron && POWER_CTRL(ctrl))
293                 pciehp_power_off_slot(slot);
294 
295         return 0;
296 
297 err_out_free_ctrl_slot:
298         cleanup_slot(ctrl);
299 err_out_release_ctlr:
300         pciehp_release_ctrl(ctrl);
301 err_out_none:
302         return -ENODEV;
303 }
304 
305 static void pciehp_remove(struct pcie_device *dev)
306 {
307         struct controller *ctrl = get_service_data(dev);
308 
309         cleanup_slot(ctrl);
310         pciehp_release_ctrl(ctrl);
311 }
312 
313 #ifdef CONFIG_PM
314 static int pciehp_suspend(struct pcie_device *dev)
315 {
316         return 0;
317 }
318 
319 static int pciehp_resume(struct pcie_device *dev)
320 {
321         struct controller *ctrl;
322         struct slot *slot;
323         u8 status;
324 
325         ctrl = get_service_data(dev);
326 
327         /* reinitialize the chipset's event detection logic */
328         pcie_enable_notification(ctrl);
329 
330         slot = ctrl->slot;
331 
332         /* Check if slot is occupied */
333         pciehp_get_adapter_status(slot, &status);
334         mutex_lock(&slot->hotplug_lock);
335         if (status)
336                 pciehp_enable_slot(slot);
337         else
338                 pciehp_disable_slot(slot);
339         mutex_unlock(&slot->hotplug_lock);
340         return 0;
341 }
342 #endif /* PM */
343 
344 static struct pcie_port_service_driver hpdriver_portdrv = {
345         .name           = PCIE_MODULE_NAME,
346         .port_type      = PCIE_ANY_PORT,
347         .service        = PCIE_PORT_SERVICE_HP,
348 
349         .probe          = pciehp_probe,
350         .remove         = pciehp_remove,
351 
352 #ifdef  CONFIG_PM
353         .suspend        = pciehp_suspend,
354         .resume         = pciehp_resume,
355 #endif  /* PM */
356 };
357 
358 static int __init pcied_init(void)
359 {
360         int retval = 0;
361 
362         pciehp_firmware_init();
363         retval = pcie_port_service_register(&hpdriver_portdrv);
364         dbg("pcie_port_service_register = %d\n", retval);
365         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
366         if (retval)
367                 dbg("Failure to register service\n");
368 
369         return retval;
370 }
371 
372 static void __exit pcied_cleanup(void)
373 {
374         dbg("unload_pciehpd()\n");
375         pcie_port_service_unregister(&hpdriver_portdrv);
376         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
377 }
378 
379 module_init(pcied_init);
380 module_exit(pcied_cleanup);
381 

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